Speed-changer.



No. 698,13. v

N. CHBISTENSUN.

SPEED CHANGER.

(Application led Sept. 20, 4901.)

Pafened Apr. 22, |9o2.

(No Model.)

Rm Tins co, PHOTO-Unic. WASHINGTON, D. c.

UNITED STATES' PATENT OFFICE.4 y

TO JULIUS W. A. LUNDSKOG, OF LYNN,

MASSACHUSETTS. i

SPEED-CHANGER.

SPECIFICATION forming part of Letters atent No. 698,103, dated April 22,

Application filed September 20, 1.901. Serial No. '75,802'. (No model.)

To all whom, it may concern:

Be it known that I, NILS OHRISTENSON, a citizen of the United States, and a resident of Lynn, county of Essex, State of Massachu setts, have invented an Improvement in Speed-Changers, of which the following de scription, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention is a speed-changer, the object thereof being to produce an exceedingly compact and simple speed-changer capable of varying the throw or coming to a deadl center, as required, without stoppingthe driving-shaft. 1 r

The various advantages and V constructional details of my invention will be pointed out in the course of the following description, reference being hadto the'ac'companying drawings, in which'I have illustrated a preferred embodiment of my invention.

In the drawings, Figure l represents in side elevation, partly broken away, a shaft provided with my invention.. Fig. 2 is a sectional view on the line2 2, Fig. 1, looking toward the right. Fig. 3 is a sectional view on the line 3 3, Fig. l. Fig. 4 is a horizontal sectional view taken on the line 44., Fig. 2.

While my invention may be applied to any of the usual situations, I have illustrated it fory convenience as applied to a line-shafting a, provided with a driving-pulley c'. At its right-hand portion the shaft a is made hollow tocontain alongitudinally-movable rackbar a2, keyed within the shaft a, as indicated at a3, said rack-bar being actuated by any suitable means, as by a lever a4, pivoted at 'a5 to a collar a on said rack-bar, although any other actuating means may be employed. Therack-bar 052 is in mesh with a pinion b, fast on a shaft b', mounted in bearings b2, se-

' cured by a collar b3 to the shaft a. The shaft b at its outer end is provided with a mitergear b4, meshing with teeth b5 at the periphery of a block or gear b, mounted loosely on the shaft c. and provided on its opposite face with an eccentric b'. On the eccentric b7 .is

mounted a second eccentric bs, free to turnv From the outside eccentric b8 proconnected by a link thereon. jects an integral arm b9,

b10 to an arm blz, projecting from a hub bis,

secured xedly to the'shaft a', sothat the outfside eccentric bs, although'V free to change its position toward andfrom the shaft alaccord# ing tothe positionto which the inner eccensaid shaftbut because of the link connecstantially the same positionwith relation to said shaft; but the inner eccentric lb7 is alwaysfree to be rotated with relation to the shaft a, said rotation beingaccomplish'ed by the rack-and-pinion movement explained.

Preferably stops are provided for permitting the relative rotation of the two eccentrics, there sbeing herein shown for this purpose a stop s'` on the eccentric bs andopposite stops s' s2 projecting from the eccentric carrier or block b, so that when `the eccentric b7 isrotated a half-turnone way'orthe other one or the otherof these stops s s2 will prevent the further rotation ofthe eccentric lb7 with relation to the eccentric bs by contacting with the stops.

Surrounding vthe eccentric -bs is an eccentric-strap b14,'from which reciprocatory motion may be communicated in any suitable manner, as by pivoting an arm b15 to a knuckle b16 thereon. v

In operation if an extreme throw of the arm` `b15 is required the two eccentrics are brought into the relative position shown in Fig. 2, and if, on the other hand, the arm b15 is to be brought at rest without stopping the rotation vof the shaft a the eccentric bI is vsimply. given'a thereby causing itsl thick portion to offset the corresponding thick portion of the eccentric bs, and thus bring the eccentric-strap b14 into eccentric position with relation to the driving-shaft @,'and all the intermediatevaand thereby moving longitudithe lever a4, as desired.

nally the rack-bar a2 within the spirit and scope of my invention.

Y tric b7 may be moved, is not free to rotate on tion with said shaft occupies invariablysub half-turn vto the left, Fig. 2,

riations in throw of the arm b15'arey secured f plished with extreme ease simply by shifting I do not limit myself in all respects to the details shown and described, as various changes and modifications can be resorted to,4

I am aware that various individual parts of the mechanism are old--as, for instance, 1ongitudinally-movable rack-and-pinion devices have been before employed and single eccen tries have been employed-and accordingly I do not claim the same broadly.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A speed-changer comprising a rotary shaft, an eccentric carried thereby and held against rotation thereon and a second eccen.

tric carried by said shaft and rotatable with relation thereto for changing the radial position of the first eccentric, and means for positively rotating said second eccentric.

2. A speed changer comprising a' rotary shaft, an` eccentric carried thereby and nonrotatable thereon, a second eccentric carried bysaid shaftfand rotatable thereon in en-` gagement with said first eccentric,.and a rackand-pinion device for positively rotatingsaid second eccentric, and means for operating -said rack-and-pinion device independently of other and carried by said shaft, and means for rotating the inner eccentric independently of said shaft and of the other eccentric, said means including a gear carried by said shaft and connected with said inner eccentric and a raclr and pinion for driving said gear, said rack being movable longitudinally of said shaft.

5. A speed-changer comprising a rotary shaft, two eccentrics mounted one on the other and carried by said shaft, means permitting the outer eccentric to move outwardly and inwardly with relation to said shaft and requiring the shaft and said outer eccentric to rotate in unison, and means for rotating the inner eccentric independently of said shaft and of the other eccentric, said means including a gear carried by said shaft and connected with said inner eccentric and a rack andpinion for driving said gear, said rack being movable longitudinally of said shaft.

6. A speed-changer comprisingfa rotary shaft, two eccentrics mounted one on the other and carried by said shaft, an arm extending from the outer eccentric, a hub and arm xed on said shaft adjacent thereto, and a link connecting said two arms, andxmeans for rotating the inner eccentric independently of said shaft and of the other eccentric.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

NILS CHRISTENSON.

Vitnesses:

GEO. H. MAXWELL, JULIUs W. A. LUNDsKoo. 

